Deficiency's?

My brother has 4 plants in 3 gallon pots all are in promix hp amended with gaia green power bloom. He waters when the plants are dry . There's lots of wind and sun. He doesn't ph but hasn't the entire time and our city water is right around 7. Two of the plants look ok and 2 look terrible. Any ideas?
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Can you get a close-up on the 4th picture I can't tell if it's calcium or potassium deficiency but it's likely caused by the high pH locking something out? Are these all the same strain?
 
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